#include <stdio.h>

#define M 10
#define N 20
#define SUM1 M+N
#define SUM2 (M+N)

int main(int argc, const char *argv[])
{
	int x = 3 * SUM1;
	// int x = 3 * M+N;
	// int x = 3 * 10+20;
	printf("%d\n", x); // 50

	int y = 3 * SUM2;
	// int x = 3 * (M+N);
	// int x = 3 * (10+20);
	printf("%d\n", y); // 90

	return 0;
}
